Rapid and ultrahigh ethanol sensing based on Au-coated ZnO nanorods

被引:93
作者
Li, Chengchao [1 ]
Li, Limiao [1 ]
Du, Zhifeng [1 ]
Yu, Hongchun [1 ]
Xiang, Yingying [1 ]
Li, Yuan [1 ]
Cai, Yong [1 ]
Wang, Taihong [1 ]
机构
[1] Hunan Univ, Micronano Technol Res Ctr, Changsha 410082, Peoples R China
关键词
D O I
10.1088/0957-4484/19/03/035501
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Rapid and ultrahigh sensing is realized from Au-coated ZnO rods with diameters down to 15 nm. Both the small diameters and the Au coating make the surface-depletion effect more pronounced for gas sensing. Such enhanced surface depletion increases the sensitivity, lowers the operation temperature and decreases the response time. A sensitivity of 89.5-100 ppm ethanol is obtained with response time shorter than 2 s at 300 degrees C, and the operation temperature can be as low as 150 degrees C. It is found that the Au coating improves the sensitivity by three times; this is much higher than that of noble metal-doped metal oxide sensors controlled by a grain-boundary barrier. Our results imply that the surface-depletion model is very helpful in fabricating high performance gas sensors.
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页数:4
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